LVS+keepalived
echo "1" > /proc/sys/net/ipv4/ip_forward --允许转发
ipvsadm -A -t 192.168.1.20:80 -s wlc --为LVS添加算法，WLC为最小负载
ipvsadm -a -t 192.168.1.20:80 -r 192.168.1.9:80 -g --添加客户端
ipvsadm -a -t 192.168.1.20:80 -r 192.168.1.69:80 -g
[root@master ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.1.20:80 wlc
-> 192.168.1.9:80 Route 1 0 0
-> 192.168.1.69:80 Route 1 0 0
此时Activeconn和inActconn都为0，因为无客户端的请求
【安装LVS】
1、【主从都要执行】
yum -y install ipvsadm
ipvsadm -C 清除lvs上所有的规则
2、【keepalived】 主从都要配置
[root@CentOS-LVS_MASTER ~]# wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz
[root@CentOS-LVS_MASTER ~]# tar zxvf keepalived-1.2.4.tar.gz
[root@CentOS-LVS_MASTER ~]# cd keepalived-1.2.4
[root@CentOS-LVS_MASTER keepalived-1.2.4]# ./configure && make && make install
######### 将keepalived做成启动服务，方便管理##########
[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[root@CentOS-LVS_MASTER ~]# mkdir /etc/keepalived/
[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
[root@CentOS-LVS_MASTER ~]# cp /usr/local/sbin/keepalived /usr/sbin/
[root@CentOS-LVS_MASTER ~]# service keepalived start | stop
2、开启路由转发
[root@CentOS-LVS_MASTER ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
[root@CentOS-LVS_MASTER ~]# sysctl -p
3、配置keepalived
! Configuration File for keepalived
global_defs {
notification_email {
}
notification_email_from [email protected]
smtp_server 127.0.0.1
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.20
}
}
virtual_server 192.168.1.20 80 {
delay_loop 6
lb_algo wlc
lb_kind DR
# persistence_timeout 60
protocol TCP
real_server 192.168.1.69 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.9 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
##从的话，只要修改2个地方就行了
一个是state 改为BACKUP
一个是priority 改为比100小就行了
然后再开启keepalived服务
在查看ipvsadm -ln就会出现配置文件中的服务器列表了
查看主从上是否有vip这个ip
3、【配置后端服务器】---让后端web能与vip通信
vim 1.sh
#!/bin/bash
#description : start realserver
VIP=192.168.1.20
/etc/rc.d/init.d/functions
case "$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS Directorserver"
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
然后执行该脚本 sh 1.sh start
最后查看web上的ip信息，看看是否有vip
【检测】
1、查看主上面的日志信息
然后停了主上面的keepalived服务，查看从上面的日志信息：
然后停了后端其中一台WEB，看看lvs会不会把他给剔除掉